WD Blue 320GB  Desktop  Hard Disk Drive - 7200 RPM SATA 6 Gb/s 16MB Cache 3.5 Inch  - WD3200AAKX IntelliSeek: Calculates optimum seek speeds to lower power consumption, noise and vibration. Data LifeGuard: Advanced algorithms monitor your drive continuously so it stays in optimum health. NoTouch Ramp Load Technology: Safely positions the recording head off the disk surface to protect your data. 2-year manufacturer limited warranty Package includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary.